drm/amdgpu: Skip mark offset for high priority rings

commit ef3c36a6

 upstream

Only low priority rings are using chunks to save the offset.
Bypass the mark offset callings from high priority rings.

Signed-off-by: Jiadong Zhu <Jiadong.Zhu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit ef3c36a6

)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>